정량적 서비스 Granularity 측정 방법

The higher the granularity of a fact table the more data (or in an excel sheet: rows) you will have. But the granularity of your data also determines what kind of information you can get out of the stored data. So to aggregate data you need of course the same granularity. (A weekly report can only be generated when you have time realted data stored. At least it should be a “week”, better it is to have “day”.)